LED lighting drive power supply LSI circuit

摘要

Problem to be solved: to provide an LED driving power supply LSI circuit for storing a power supply circuit IC in one LSI chip capable of reducing weight and cost.In an LED lighting drive power supply, an LED controller IC6 has an operational amplifier 2 for dimming voltage buffer, an operational amplifier 3 for monitor voltage amplification, a dimming voltage, a monitor voltage, an adding operational amplifier 4, a BGR current, a variable resistor, and BGR voltage It has a diode 9 (auxiliary) for high frequency bypass.Since the LED controller IC6 is used as the LED driving nMOSFET 7, it is possible to construct a feedback system for driving the led directly with a voltage obtained by full wave rectification of the AC voltage.Diagram